187438428 has 24 divisors (see below), whose sum is σ = 485951760. Its totient is φ = 62479440.

The previous prime is 187438409. The next prime is 187438441. The reversal of 187438428 is 824834781.

187438428 is a `hidden beast` number, since 187 + 43 + 8 + 428 = 666.

It is a super-2 number, since 2×187438428² = 70266328582222368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867663 + ... + 867878.

It is an arithmetic number, because the mean of its divisors is an integer number (20247990).

Almost surely, 2^187438428 is an apocalyptic number.

187438428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

187438428 is an abundant number, since it is smaller than the sum of its proper divisors (298513332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

187438428 is a wasteful number, since it uses less digits than its factorization.

187438428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735554 (or 1735546 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 187438428 is about 13690.8154614691. The cubic root of 187438428 is about 572.2944634439.

The spelling of 187438428 in words is "one hundred eighty-seven million, four hundred thirty-eight thousand, four hundred twenty-eight".